The first living cells were most likely

A. aerobic, photosynthetic, eukaryotic.
B. aerobic, photosynthetic, prokaryotic.
C. anaerobic, heterotrophic, prokaryotic.
D. anaerobic, heterotrophic, eukaryotic.
E. anaerobic, chemotrophic, eukaryotic.


C. anaerobic, heterotrophic, prokaryotic.

Biology & Microbiology

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Most organs respond to _____ and _____

a. hormones; physical stimulation b. environmental signals; hormones c. hormones; neuronal signals d. environmental signals; neuronal signals e. physical stimulation; neuronal signals

Biology & Microbiology

A statement such as "If human body temperature increases to a certain level, then critical proteins will be denatured" would most likely be associated with ________

A) inductive reasoning B) deductive reasoning C) a hypothesis D) a conclusion

Biology & Microbiology

Based on what you know about resistance to infection, why are some people resistant to HIV?

A) They have a strong immune system that clears the virus completely. B) They have been immunized in an experimental program. C) They can't be infected with HIV even when exposed. D) They never engage in risky behavior and thus can't become infected.

Biology & Microbiology

At what stage does the diploid zygote form?

a. When the sperm nucleus and the egg nucleus fuse b. When the female cone begins to bud from the tree c. When the seeds drop from the tree d. When the pollen tube begins to grow

Biology & Microbiology